Page 231 - Physics

Glossary

Derived quantities obtained by either multiplying or dividing two or more
fundamental quantities. Examples are volume and speed
Derived unit obtained by combining two or more of the fundamental
units. Examples are newtons and pascal

Displacement distance covered in a particular direction
Distance length of the path taken by an object while in motion

Elastic energy energy stored in objects like springs as a result of
reversible deformation
Energy ability to do work

Elasticity ability of a deformed body to return to its original shape
and size when the forces causing the deformation are
withdrawn

Elastic limit maximum point of deformation that a body can undergo
reversible deformation

Floating the tendency of an object to be suspended in or remain
on the surface of a fl uid due to the forces exerted by the
fl uid

Force a push or a pull that is experienced by an object
Fluid a substance such as a liquid or a gas whose molecules
fl ow freely, so that it has no fi xed shape

Force of gravity the pull by which the earth, moon and other very large
bodies attract other objects towards them

Force pump a pump that uses pressure to draw water to another
surface

Free-fall a motion of objects falling to the ground without air
resistance due to the earth’s gravitational pull

Frictional force a force, normally resistive, arises from two objects in
contact moving relative to one another
Fundamental force the basic force in nature which cannot be explained by
the action of another force

Hydrometer an instrument used for determining the relative density of
liquids. It consists of a glass bulb and a cylindrical stem

Inclined plane a smooth fl at rigid surface slanted at an angle to the
horizontal. It is an example of a simple machine
Insoluble granules particles which do not dissolve in liquid

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